asleep vs unconscious

asleep is not a noun while unconscious is a noun.

Word	Noun	Adjective	Verb	Adverb
asleep	No	Yes	No	Yes
unconscious	Yes	Yes	No	No

asleep (noun)	unconscious (noun)
	that part of the mind wherein psychic activity takes place of which the person is unaware

asleep (adjective)	unconscious (adjective)
in a state of sleep	not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead
dead	without conscious volition
lacking sensation	(followed by `of') not knowing or perceiving

asleep (adverb)	unconscious (adverb)
into a sleeping state
in the sleep of death